Sand-blast machine.



Patented Sept. 3, |90I.

No. salmi?.

A. F. BABDWELL.

SAND BLAST MACHINE.

(Applicion 'Bled Inn. 24, 1896,)

(No Model.)

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STATES PATnN trice.

ARTHUR F. BARDWELL, OE STAMFORD, CONNECTICUT, ASSIGNOR TO TI-IE YALE du TOVVNE MANUFACTURING COMPANY, OF SAME PLACE.

SAND-BLAST MACHINE.

SPECIFICATION forming part of Letters Patent N o. 681,867, dated September 3, 1901. Application filed January 24, 1896. Serial No. 576,724. (No mndelt) T @ZZ whom, t may concern: an outlet-opening 4, which leads to the sand- Be it known that I, ARTHUR F. BARDWELL, pipe 5. This deflector is of such construction a citizen of the United States, and a resident as to deflect and not break the sand and also of Stamford, in the county of Fairfield and to allowsand to accumulate underit,as shown. j 5 State of Connecticut, have invented certain The sand-pipe may be of ordinary construcnew and useful Improvements in Sand-Blast tion, and it is connected at one end with the Machines, of which the following is a speciopeninget and at its other end with a jet-pipe iication. 6, through which compressed air passes, it

My invention relates to an improvement in heilig supplied t0 the jet G from a compressor 6c 1o the construction of sand-blast machines for through the pipe 7.

finishing builders hardware where a dull or 8 represents a valve located 'in the pipe 7 roughened appearance is imparted to metal and connected b v means of a lever 9 and rod facings and is different from machines ordi- 10 with a treadle 11, which on being denarily constructed in that there is no interpressed allows the air to I'low into the jet 6. 65 ference of any nature to break the force 0f 12 represents a short tube through which the sand before it comes in contact with the the compressed air passes to the chamber 1, work to be treated and that the force with and 13 represents a funnel-shaped deilector which the sand strikes the work is aided by carried by the chamber for allowing the air gravity only and not by any artificial means, to expand and diffuse through the chamber, 7o 2o that there are means to collect and reuse the so that when the air and sand enter the chamsand until it becomes too fine, and, finally, beronly the sand will be forced onto the Work, means for removing and drowning the dust; thus doing away with the strong currents of and myinvention consists of such an arrangeair directed against the work, which makes it ment of parts to accomplish the above results difficult to handle. 2 5 as will be hereinafter more fully described, In order that the work may be clearly seen and specifically set forth in the claims. and kept free from sand and dust while it is In order that myinvention may be fully unbeing operated on, I provide a draft across derstood, I will proceed to describe the same the work. This is accomplished by the folwith reference to the accompanying drawlowing arrangement of parts: 8o 3o ing, which shows in vertical section my im- 14 represents a pipe leading from the comproved machine. pressed-air pipe and projecting into ilue 15,

In the said drawing, 1 represents a chamand 24 represents a water-pipe having a spray ber in which the work 2 is to be treated. This at its exit end. These cooperate to form a chamber may be of any size, configuration, draft. However,under certain circumstances 3 5 and construction, and it is closed to the outer pipe 14; could be dispensed with. These lead air,except through the opening through which from chamber 16, which is secured to chamber the work is inserted and handled. The work 1 by any preferred means. This chamber 2 is placed under the blast through an opencommunicates with chamber 1 throughopening in the side of the box and is simplypushed ing 17, and it is provided with a projection 9o 4o in by hand, the workman having on a rubber 18 in order to form an obstructed passage for glove to protect his hand against the sand. the dust-laden air, so that whatever sand is If the shape of the piece permits it, he holds carried over the heavier particles will become it directly in his hand; but if the piece is too separated and fall into pipe 19 to be conducted short he holds it with tongs. The hole for to the lower part of sand-pipe 5.

45 the insertion of the piece maybe at any con- 22 represents a screen secured to chamber venient point in the casing of the machine, 1 in front of opening 17 and closed at the top and, in fact, some of the machines have two in order that the draft will enter chamber 16 holes in them for this purpose. These holes at the ends, (indicated by arrows 20.) This do not interfere with the circulation of air. deiectsa greater part of the sand and causes roo 5o Srepresents a suitable deilector for sand, loa draft through all parts of the chamber 1.

cated in the bottom of the chamber 1 and over 23 represents a flue which is connected with ue 15, through which the dust is conveyed by the draft created by either the spray of water at the end of pipe 24 or by the compressed air through pipe 14, or both. The dust passing through the spray of water is drowned and may be carried away and dispensed with as desired.

The operation of my device, briefly stated, is as follows: The valve is opened and compressed air is allowed to pass through the jet, and as it passes through it creates a draft through the sand-pipe, which causes the sand to pass up through this pipe and onto the work, as indicated by the arrows. As the sand and air enter the chamber the air diffuses and the sand only is directed against the work. After doing its work the greater part ot' `the sand falls to the bottom of the chamber, as indicated by the arrows, to be again used. The dust is carried out of the chamber, separated, drowned, and finally dispensed with as desired.

It will be understood that I do not limit myself to the precise arrangement ofl parts shown, as they may be changed or varied to conform to surrounding conditions where the machine is placed without departing from the spirit of my invention.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. In a sand-blast machine, the combination of the chamber in which the work is manipulated, a sand-pipe connected with the bottom and top of said chamber,a compressedair pipe connected with the said pipe for drawing sand through the same so as to cause it to pass into the chamber, and suitable means for diffusing the compressed air whereby the sand is allowed to drop onto the work by gravity alone, substantially as shown and de scribed.

2. In a sand-blast machine, the combination of a closed chamber in which the work is manipulated, said chamber being provided with an opening which is suitably connected with a discharge-flue, and suitable means for creating a draft through said flue so that air is withdrawn from said chamber to cause a current to pass across the face of the work to keep it free from dust; substantially as described.

ARTHUR F. BARDWELL.

Witnesses:

SCHUY'LER MERR'TTT, GEO. E. WHITE. 

